Sofa



FIG. 1 is a front perspective view showing a sofa;

FIG. 2 is a side perspective view of the sofa of FIG. 1;

FIG. 3 is a rear perspective view of the sofa of FIG. 1;

FIG. 4 is a bottom view of the sofa of FIG. 1;

FIG. 5 is a top view of the sofa of FIG. 1; and,

FIG. 6 is an alternative bottom view of the sofa of FIG. 1. 

CLAIM The ornamental design for a sofa, as shown and described. 